Package org.springframework.test.context.bean.override

Class BeanOverrideHandler

java.lang.Object

org.springframework.test.context.bean.override.BeanOverrideHandler

public abstract class BeanOverrideHandler
extends Object

Handler for Bean Override injection points that is responsible for creating the bean override instance for a given set of metadata and potentially for tracking the created instance.

WARNING: Implementations are used as a cache key and must implement proper equals() and hashCode() methods based on the unique set of metadata used to identify the bean to override. Overridden equals() and hashCode() methods should also delegate to the super implementations in this class in order to support the basic metadata used by all bean overrides. In addition, it is recommended that implementations override toString() to include all relevant metadata in order to enhance diagnostics.

Concrete implementations of BeanOverrideHandler can store additional metadata to use during override instance creation — for example, based on further processing of the annotation, the annotated field, or the annotated class.

NOTE: Only singleton beans can be overridden. Any attempt to override a non-singleton bean will result in an exception.

Since:

6.2

Author:

Simon Baslé, Stephane Nicoll, Sam Brannen

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BeanOverrideHandler(@Nullable Field field, ResolvableType beanType, @Nullable String beanName, BeanOverrideStrategy strategy)

Method Summary

Modifier and Type	Method	Description
protected abstract Object	createOverrideInstance(String beanName, @Nullable BeanDefinition existingBeanDefinition, @Nullable Object existingBeanInstance)	Create a bean override instance for an existing BeanDefinition or an existing singleton bean, based on the metadata in this BeanOverrideHandler.
boolean	equals(Object other)
static List<BeanOverrideHandler>	forTestClass(Class<?> testClass)	Process the given testClass and build the corresponding BeanOverrideHandler list derived from @BeanOverride fields in the test class and its type hierarchy.
final @Nullable String	getBeanName()	Get the bean name to override, or null to look for a single matching bean of type getBeanType().
final ResolvableType	getBeanType()	Get the bean type to override.
final @Nullable Field	getField()	Get the annotated Field.
final BeanOverrideStrategy	getStrategy()	Get the BeanOverrideStrategy for this BeanOverrideHandler, which influences how and when the bean override instance should be created.
int	hashCode()
String	toString()
protected void	trackOverrideInstance(Object override, SingletonBeanRegistry singletonBeanRegistry)	Track the supplied bean override instance that was created by this BeanOverrideHandler.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

BeanOverrideHandler

protected BeanOverrideHandler(@Nullable Field field,
 ResolvableType beanType,
 @Nullable String beanName,
 BeanOverrideStrategy strategy)

Method Details

forTestClass

public static List<BeanOverrideHandler> forTestClass(Class<?> testClass)

Process the given testClass and build the corresponding BeanOverrideHandler list derived from @BeanOverride fields in the test class and its type hierarchy.

This method does not search the enclosing class hierarchy and does not search for @BeanOverride declarations on classes or interfaces.

Parameters:

testClass - the test class to process

Returns:

a list of bean override handlers

See Also:

• findAllHandlers(Class)

getField

public final @Nullable Field getField()

Get the annotated Field.

getBeanType

public final ResolvableType getBeanType()

Get the bean type to override.

getBeanName

public final @Nullable String getBeanName()

Get the bean name to override, or null to look for a single matching bean of type getBeanType().

getStrategy

public final BeanOverrideStrategy getStrategy()

Get the BeanOverrideStrategy for this BeanOverrideHandler, which influences how and when the bean override instance should be created.

createOverrideInstance

protected abstract Object createOverrideInstance(String beanName,
 @Nullable BeanDefinition existingBeanDefinition,
 @Nullable Object existingBeanInstance)

Create a bean override instance for an existing BeanDefinition or an existing singleton bean, based on the metadata in this BeanOverrideHandler.

Parameters:

beanName - the name of the bean being overridden

existingBeanDefinition - an existing bean definition for the supplied bean name, or null if not available or not relevant

existingBeanInstance - an existing instance for the supplied bean name for wrapping purposes, or null if not available or not relevant

Returns:

the instance with which to override the bean

See Also:

• trackOverrideInstance(Object, SingletonBeanRegistry)

trackOverrideInstance

protected void trackOverrideInstance(Object override,
 SingletonBeanRegistry singletonBeanRegistry)

Track the supplied bean override instance that was created by this BeanOverrideHandler.

The default implementation does not track the supplied instance, but this can be overridden in subclasses as appropriate.

Parameters:

override - the bean override instance to track

singletonBeanRegistry - a registry in which this handler can store tracking state in the form of a singleton bean

See Also:

• createOverrideInstance(String, BeanDefinition, Object)

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object